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Quarterly Financial Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues [Abstract]                      
Earned Premiums $ 495.6 $ 507.5 $ 512.8 $ 509.9 $ 520.8 $ 527.3 $ 529.8 $ 529.2 $ 2,025.8 $ 2,107.1 $ 2,173.6
Net Investment Income 76.9 82.4 74.6 80.8 72.9 70.4 75.2 77.4 314.7 295.9 298.0
Other Income 0.3 0.1 0.2 0.2 0.2 0.2 0.2 0.2 0.8 0.8 1.0
Net Realized Gains on Sales of Investments 20.8 49.1 2.3 26.9 5.5 50.9 4.1 4.9 99.1 65.4 33.7
Other-than-temporary Impairment Losses:                      
Total Other-than-temporary Impairment Losses (7.6) (3.5) (2.3) (2.4) (3.1) (3.2) (0.4) (0.5) (15.8) (7.2) (11.4)
Portion of Losses Recognized in Other Comprehensive Income 0 0.1 1.3 0.5 0.3 0 0 0 1.9 0.3 0.1
Net Impairment Losses Recognized in Earnings (7.6) (3.4) (1.0) (1.9) (2.8) (3.2) (0.4) (0.5) (13.9) (6.9) (11.3)
Total Revenues 586.0 635.7 588.9 615.9 596.6 645.6 608.9 611.2 2,426.5 2,462.3 2,495.0
Expenses [Abstract]                      
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses 315.5 338.3 354.2 349.2 413.0 368.7 423.8 376.6 1,357.2 1,582.1 1,645.7
Insurance Expenses 162.9 170.1 163.1 158.3 169.5 172.7 167.7 162.4 654.4 672.3 683.6
Interest and Other Expenses 26.2 25.3 25.2 23.8 20.1 22.7 20.9 21.8 100.5 85.5 83.9
Total Expenses 504.6 533.7 542.5 531.3 602.6 564.1 612.4 560.8 2,112.1 2,339.9 2,426.7
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest         (6.0) 81.5 (3.5) 50.4   122.4  
Income Tax Expense (26.6) (33.4) (13.9) (26.0) 4.3 (25.9) 5.1 (14.1) (99.9) (30.6) (6.6)
Income from Continuing Operations 54.8 68.6 32.5 58.6 (1.7) 55.6 1.6 36.3 214.5 91.8 61.7
Income from Discontinued Operations 0.4 1.5 1.5 (0.2) 3.6 0 0.7 7.3 3.2 11.6 12.8
Net Income 55.2 70.1 34.0 58.4 1.9 55.6 2.3 43.6 217.7 103.4 74.5
Income (Loss) from Continuing Operations Per Unrestricted Share [Abstract]                      
Income from Continuing Operations Per Unrestricted Share - Basic $ 0.98 $ 1.21 $ 0.56 $ 1.00 $ (0.03) $ 0.95 $ 0.03 $ 0.61 $ 3.75 $ 1.55 $ 1.02
Income from Continuing Operations Per Unrestricted Share - Diluted $ 0.98 $ 1.21 $ 0.56 $ 1.00 $ (0.03) $ 0.95 $ 0.03 $ 0.60 $ 3.74 $ 1.54 $ 1.02
Net Income (Loss) Per Unrestricted Share [Abstract]                      
Net Income Per Unrestricted Share - Basic $ 0.99 $ 1.24 $ 0.59 $ 1.00 $ 0.03 $ 0.95 $ 0.04 $ 0.73 $ 3.81 $ 1.75 $ 1.23
Net Income Per Unrestricted Share - Diluted $ 0.99 $ 1.23 $ 0.59 $ 1.00 $ 0.03 $ 0.95 $ 0.04 $ 0.72 $ 3.80 $ 1.74 $ 1.23
Dividends Paid to Shareholders Per Share $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.96 $ 0.96 $ 0.96
Income from Continuing Operations before Income Taxes $ 81.4 $ 102.0 $ 46.4 $ 84.6         $ 314.4 $ 122.4 $ 68.3